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        | A political and economic system based on a pyramid structure          |  | 
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        | Peasants, who worked a piece of land in return for food and housing           |  | 
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        | One who pledged loyalty to a higher lord, or overlord          |  | 
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        | He was the grand landlord of his region        |  | 
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        | These “sea rovers” swooped down from Scandinavia in their long, narrow boats, attacking seacoasts and traveling inland on rivers            |  | 
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        | A daring Christian missionary, who voyaged to the Vikings’ homelands                 |  | 
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        | The most unworthy pope of all time       |  | 
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        | A ruler of the East Frankish (German) section of Charlemagne’s old territory        |  | 
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        | It revived, in name if not reality, the empire of Charlemagne          |  | 
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        | An act where a rich man could buy himself the office of bishop        |  | 
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        | A monastery in France that was independent of any control by a local lord or secular ruler            |  | 
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